linux-kernel - Re: [PATCH v2 11/14] mm: Remove devmap related functions and page table bits

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Message-ID: <911e7b40-e30e-477f-a4e5-df34df1d0e14@redhat.com>
Date: Tue, 17 Jun 2025 11:36:46 +0200
From: David Hildenbrand <david@...hat.com>
To: Alistair Popple <apopple@...dia.com>, akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, gerald.schaefer@...ux.ibm.com,
 dan.j.williams@...el.com, jgg@...pe.ca, willy@...radead.org,
 linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
 linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
 linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de,
 zhang.lyra@...il.com, debug@...osinc.com, bjorn@...nel.org,
 balbirs@...dia.com, lorenzo.stoakes@...cle.com,
 linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
 linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
 linux-cxl@...r.kernel.org, dri-devel@...ts.freedesktop.org, John@...ves.net,
 m.szyprowski@...sung.com, Will Deacon <will@...nel.org>,
 Björn Töpel <bjorn@...osinc.com>,
 Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v2 11/14] mm: Remove devmap related functions and page
 table bits

On 16.06.25 13:58, Alistair Popple wrote:
> Now that DAX and all other reference counts to ZONE_DEVICE pages are
> managed normally there is no need for the special devmap PTE/PMD/PUD
> page table bits. So drop all references to these, freeing up a
> software defined page table bit on architectures supporting it.
> 
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> Acked-by: Will Deacon <will@...nel.org> # arm64
> Suggested-by: Chunyan Zhang <zhang.lyra@...il.com>
> Reviewed-by: Björn Töpel <bjorn@...osinc.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb